Revert "Delete CC."

cc/debug/lap_timer.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cc/debug/lap_timer.h"
+
+#include "base/logging.h"
+
+namespace cc {
+
+namespace {
+
+base::TimeDelta Now() {
+  return base::ThreadTicks::IsSupported()
+             ? base::ThreadTicks::Now() - base::ThreadTicks()
+             : base::TimeTicks::Now() - base::TimeTicks();
+}
+
+}  // namespace
+
+LapTimer::LapTimer(int warmup_laps,
+                   base::TimeDelta time_limit,
+                   int check_interval)
+    : warmup_laps_(warmup_laps),
+      remaining_warmups_(0),
+      remaining_no_check_laps_(0),
+      time_limit_(time_limit),
+      check_interval_(check_interval) {
+  DCHECK_GT(check_interval, 0);
+  Reset();
+}
+
+void LapTimer::Reset() {
+  accumulator_ = base::TimeDelta();
+  num_laps_ = 0;
+  remaining_warmups_ = warmup_laps_;
+  remaining_no_check_laps_ = check_interval_;
+  Start();
+}
+
+void LapTimer::Start() {
+  start_time_ = Now();
+}
+
+bool LapTimer::IsWarmedUp() { return remaining_warmups_ <= 0; }
+
+void LapTimer::NextLap() {
+  if (!IsWarmedUp()) {
+    --remaining_warmups_;
+    if (IsWarmedUp()) {
+      Start();
+    }
+    return;
+  }
+  ++num_laps_;
+  --remaining_no_check_laps_;
+  if (!remaining_no_check_laps_) {
+    base::TimeDelta now = Now();
+    accumulator_ += now - start_time_;
+    start_time_ = now;
+    remaining_no_check_laps_ = check_interval_;
+  }
+}
+
+bool LapTimer::HasTimeLimitExpired() { return accumulator_ >= time_limit_; }
+
+bool LapTimer::HasTimedAllLaps() { return !(num_laps_ % check_interval_); }
+
+float LapTimer::MsPerLap() {
+  DCHECK(HasTimedAllLaps());
+  return accumulator_.InMillisecondsF() / num_laps_;
+}
+
+float LapTimer::LapsPerSecond() {
+  DCHECK(HasTimedAllLaps());
+  return num_laps_ / accumulator_.InSecondsF();
+}
+
+int LapTimer::NumLaps() { return num_laps_; }
+
+}  // namespace cc